An agent may be used for the detection, investigation and conviction of offenders of crimes, corruption, criminal offences of extremism, a criminal offence of abuse of authority of a public official, or a criminal offence of money laundering. Their use is permitted only if the detection, investigation and conviction of offenders of the listed criminal offences would otherwise be much more difficult, and the acquired facts justify the suspicion that a criminal offence was committed or such criminal offence is to be committed. The conduct of an agent must be in compliance with the purposes of the CPC (Section 117 of the CPC) and must be proportionate to the illegality of the conduct, detection, investigation or conviction which they participate in. An agent must not proactively induce the commission of a criminal offence; this shall not apply if it is a criminal offence of bribery of a public official or a foreign public official, and the ascertained facts suggest that the offender would commit such a criminal offence even if the warrant to use an agent was not issued.
The period of the use of an agent cannot be longer than six months. This period may be extended by only two months by the presiding judge and, in the preliminary hearing upon the petition of the public prosecutor, the judge for the preliminary hearing, although they may do so repeatedly.